wxWidgets - wxWidgets: Cross-Platform GUI Library
ImBatch - ImBatch is a batch image processor with a nice graphical user interface.
Electron - Build cross platform desktop apps with web technologies
Batch Image Resizer - Resize, crop, shrink, flip, exif-rotate, convert, enhance, process multiple pictures and photos with professional software! 120+ Actions, 30+ Image Formats
GTK - GTK+ is a multi-platform toolkit for creating graphical user interfaces.
Ralpha Image Resizer - High-speed image batch conversion tool